Dyslexics' Visual Attention Field

ID: NCT03285789
Status: Not yet recruiting
Phase: N/A
Start Date: March 01, 2018
First Submitted: September 14, 2017
Last Updated: February 22, 2018
Results: N/A
Sponsors & Collaborators: Hospices Civils de Lyon
Location: France
Conditions: Dyslexia
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Study Description

Brief Summary

dyslexia is often considered like a phonological deficit but some researches show that a visual attention (V-A) deficit can occur in dyslexia. The investigator want to show that some dyslexics have a reduced V-A field in visual search when the investigator use separable feature (letter-like).

If the investigator demonstrate that, he will show that V-A deficit can be transpose to an ability acquired before reading, the visual search. Therefore, the V-A deficit can't be a consequence of reading problem but a cause of it for some dyslexics.

The investigator could imagine an earlier diagnosis for children at risk to develop dyslexia and make reeducation more specific for the deficit observed.

Detailed Description

Condition or disease Intervention/treatment Phase

Dyslexia

Other: Passing tests in dyslexics with reduced eva
Other Names
Other: Passing tests in controls
Other Names
N/A

Tracking Information

First Submitted DateSeptember 14, 2017
Last Update Posted DateFebruary 22, 2018
Anticipated Start DateMarch 01, 2018
Anticipated Completion DateMarch 02, 2020
Anticipated Primary Completion DateMarch 02, 2020
Results First Submitted DateN/A
Received Results Disposit DateN/A

Current Primary Outcome Measures

  • Respond time in visual search in different condition of view (full view or reduced view) with separable feature. [Time Frame: Day 0]

    The subject will have to find a target among distractors, when he will find it, he will have to push a button and we will have his respond time. We will compare the respond time in two view condition: the participant will see all the visual scene or he will have reduced visible window so he won't see all the scene, the periphery will be hide and he will have to move his sight to show it.

Original Primary Outcome Measures

Not Available

Current Secondary Outcome Measures

  • respond time in function of the distractors' number [Time Frame: Day 0]

    The subject will have to find a target among distractors, when he will find it, he will have to push a button and we will collect his respond time. We compare the respond time between two number of distractors (24 or 48)

  • visual exploration of the scene [Time Frame: Day 0]

    with an eye tracker the investigator will analyze the ocular movements during visual search (saccades and fixations) and the equip will compare the visual behavior between the different groups and the different conditions.

  • visuo-spatial perception [Time Frame: Day 0]

    the investigator will test with different exercises the elementary visuo spatial perception of the participant and he will compare between groups and also he will make correlation with the respond time in visual search.

  • visual attention span (VAS) [Time Frame: Day 0]

    the subject have to report orally a 5 letters' string presented during 200 ms, the investigator could see if a correlation exist between VAS and RT, VAS and visual exploration, VAS and visuo spatial perception.

Original Secondary Outcome Measures

Not Available

Study Design

Brief TitleDyslexics' Visual Attention Field
Official TitleEvaluation of the Visuo-attention Field of Symbols Versus Objects Visual Search in Dyslexic Subjects. DyslexiaSPOTLIGHT
Brief Summary

dyslexia is often considered like a phonological deficit but some researches show that a visual attention (V-A) deficit can occur in dyslexia. The investigator want to show that some dyslexics have a reduced V-A field in visual search when the investigator use separable feature (letter-like).

If the investigator demonstrate that, he will show that V-A deficit can be transpose to an ability acquired before reading, the visual search. Therefore, the V-A deficit can't be a consequence of reading problem but a cause of it for some dyslexics.

The investigator could imagine an earlier diagnosis for children at risk to develop dyslexia and make reeducation more specific for the deficit observed.

Detailed Description

Study TypeInterventional
Study PhaseN/A
Estimated Enrollment
63
Allocation
Non-Randomized
Interventional Model
Parallel Assignment
Masking
None (Open Label)
Primary Purpose
Other
Conditions
Dyslexia
Target Follow-Up Duration N/A
Biospecimen:
N/A
Sampling MethodN/A
Study PopulationN/A
Intervention
Other: Passing tests in dyslexics with reduced eva

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities. All of these tests will be made during an unique visit of 1h30.

Other Names
Other: Passing tests in controls

Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it verbally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial test to judge his visuo spatial abilities. "test de l'alouette" : reading test during 3 minutes, we note the number of word read and the errors. We obtain lexical age. All of these tests will be made during an unique visit of 1h30.

Other Names
Study Groups/Cohorts
Dyslexics with reduced visual attention span
21 subjects diagnosed dyslexics with reduced visual attention span

Dyslexics with normal visual attention span

controls

Study Arms
Active Comparator controls
Other : Passing tests in controls
Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it verbally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial test to judge his visuo spatial abilities. "test de l'alouette" : reading test during 3 minutes, we note the number of word read and the errors. We obtain lexical age. All of these tests will be made during an unique visit of 1h30.

Experimental Dyslexics with normal visual attention span
Other : Passing tests in dyslexics with reduced eva
Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities. All of these tests will be made during an unique visit of 1h30.

Experimental Dyslexics with reduced visual attention span
21 subjects diagnosed dyslexics with reduced visual attention span
Other : Passing tests in dyslexics with reduced eva
Visual attention span : the subject see a 5 letters strings during 200 ms and he has to report it orally whatever the order Visual search : the subject has to find a target among distractors (24 or 48) in different conditions of stimuli (conjunction feature or separable feature) and different conditions of view (full view or reduced view with the moving window paradigm) Elementary visuo spatial perception: the subject passes 6 visuo spatial tests to judge his visuo spatial abilities. All of these tests will be made during an unique visit of 1h30.

Arm Intervention/Treatment
Active Comparator controls
Other : Passing tests in controls
Experimental Dyslexics with normal visual attention span
Other : Passing tests in dyslexics with reduced eva
Experimental Dyslexics with reduced visual attention span
21 subjects diagnosed dyslexics with reduced visual attention span
Other : Passing tests in dyslexics with reduced eva

Recruitment Information

Recruitment Status:Not yet recruiting
Enrollment63
Completion DateMarch 02, 2020
Eligibility Criteria: Inclusion Criteria:
- normal or corrected to normal vision
- diagnosed dyslexics with a recent "alouette" test

Exclusion Criteria:
- other developmental problem (dysphasia, dyspraxia, ADHD)
- strabismus, amblyopia, oculomotor paralysis
GenderAll
Age8 Years to 12 Years
Accepts Healthy VolunteersAccepts Healthy Volunteers
Contacts
Listed Location Countries
France

Administrative Information

NCT Number:NCT03285789
Other Study ID Numbers
69HCL17_0333
Has Data Monitoring CommitteeNo
U.S. FDA-regulated Product Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Device Product Not Approved or Cleared by U.S. FDA: No
IPD Sharing Statement
Not Available
Responsible Party,
Study Sponsor
Hospices Civils de Lyon
Collaborators
Not Available
Investigators
Principal Investigator
Laure PISELLA, PhD
INSERM U1028 - Impact - CRNL